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16 Cards in this Set
- Front
- Back
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Define neuron doctrine
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each neuron is its own, operates alone, and is separated from other neurons by extracellular space
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What are bundles of axons called in the PNS?
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nerves
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What are bundles of axons called in the CNS?
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tracts/fasciculi
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Nissl substance is comprised of?
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RER (translates proteins)
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Where are Nisssl bodies not found?
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axon/axon hillock
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What are the 3 main types of fibrillar components in the neuron?
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1) neurofilaments
2) microfilaments 3) microtubules |
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What are neurofilaments made of/purpose?
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polymerized structural proteins that stabilize the dendrite and don't allow much change (bones)
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What are microfilaments made of/purpose?
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actin/myosin and used for motility
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What are microtubules made of/purpose?
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tubulin/proteins and used for shape/stability but especially for transport
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What are the 2 types of astrocytes and their primary location?
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1) protoplasmic (grey)
2) fibrous (white) |
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Describe the physical differences btw the types of astrocytes
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protoplasmic have short, thick dendrites
fibrous have few, thin dendrites (spider like) |
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What is the primary function of astrocytes?
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Create 'end feet' that covers the vascular system: form pia layers (ext and int limjiting membrane), surround capillaries (blood-brain barrier), separate fiber tracts
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What is the function of the oligodendrocytes and what does it not do that Schwann cells do?
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Myelinates many neurons in the CNS but inhibits neural regrowth
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What are the 2 functions of Schwann cells?
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Myelinate one axon and facilitates neural regrowth
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What is the function of microglia?
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In injured/diseased brain they phagocytose debris and secrete pro-inflammatory substances
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What is the function of ependymal cells?
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Lines the ventricles (with pia creates the choroid plexus to create CSF) and lines central canals (with astrocytes form internal limiting membrane)
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